Cloudwatch logs input plugin not streaming all log groups

Hi ,

I am using cloudwatch log input plugin to stream logs to ES using logstash.
below is my configuration.

input {
    cloudwatch_logs {
       log_group => [ "/aws" ]
       log_group_prefix => true
       access_key_id => "ABC"
       secret_access_key => "ABCD"
       #since_db => "dev/null"
       #start_position => "beginning"
       #type => "lambda"
       region => "us-east-2"

But the issue is i am not able to see all log groups in kibana which are available in AWS Cloudwatch.Few of the log groups are missing.

Can you please help me on this..!!